v2.4.0

https://stackstorm.com/2017/08/24/whats-stackstorm-2-4-already/

Added

• Add sample passive sensor at contrib/examples/sensors/echo_flask_app. (improvement) #3667

• Add pack config into action context. This is made available under the config_context key.
  #3183

• Add limit/"-n" flag and pagination note(stderr) in the CLI for st2 key list.
  Default limit is 50. #3641

• Implement pause and resume for Mistral workflow and Action Chain. Pause and resume will
  cascade down to subworkflows and/or subchains. Pause from a subworkflow or subchain
  will cascade up to the parent workflow. (new feature)

• Add pack index endpoint. It will made a request for every index defined in st2.conf and return
  the combined list of available packs.

• Added a new field timestamp_f to the GELF logging formatter that represents
  the time of the logging even in fractional time (resolution is dependent on your
  system). This allows adjacent logging events to be distinguished more accurately
  by the time they occurred.
  Contributed by Nick Maludy (Encore Technologies) #3362

• Require new STREAM_VIEW RBAC permission type to be able to view /v1/stream stream API
  endpoint. (improvement) #3676

• Add new ?events, ?action_refs and ?execution_ids query params to /v1/stream/
  API endpoint. Those query parameters allow user to filter out which events to receive based
  on the event type, action ref and execution id. By default, when no filters are provided, all
  events are returned. (new feature) #3677

• Show count of pack content (actions, sensors, triggers, rules and aliases) to be registered
  before the st2 pack install so that the delay in install is not mistaken as no response
  or hanging command. (improvement) #3586 #3675

• Allow user to specify value for "array of objects" parameter type using a simple notation
  when using st2 run CLI command. (improvement) #3646 #3670

  Contributed by Hiroyasu OHYAMA.

Changed

• Rename ST2 action runner cancel queue from st2.actionrunner.canel
  to st2.actionrunner.cancel. (improvement) #3247
• Install scripts and documentation has been updated to install MongoDB 3.4 by default (previously
  3.2 was installed by default). If you want to upgrade an existing installation, please follow
  official instructions at https://docs.mongodb.com/v3.4/release-notes/3.4-upgrade-standalone/.
  (improvement)

Removed

• The feature to use local config.yaml in packs is removed.

Fixed

• Fix retrying in message bus exchange registration. (bug fix) #3635 #3638

  Reported by John Arnold.

• Fix message bus related race condition which could, under some rare scenarios, cause first
  published message to be ignored because there were no consumers for that particular queue yet.
  This could happen in a scenario when API service came online and served a request before action
  runner service came online.

  This also fixes an issue with Redis kombu backend not working. (bug fix) #3635 #3639 #3648

• Fix logrotate configuration to delete stale compressed st2actionrunner logs #3647

• Fix trace list API endpoint sorting by start_timestamp, using ?sort_desc=True|False query
  parameters and by passing --sort=asc|desc parameter to the st2 trace list CLI command.
  Descending order by default.(bug fix) #3237 #3665

• Fix pack index health endpoint. It now points to the right controller. #3672

• Fix 'pack register content' failures appearing on some slower systems by lifting action timeout #3685

v2.3.2

https://stackstorm.com/2017/07/28/stackstorm-2-3-2-summer-bugfixes-continues/

Added

• Add regex_substring Jinja filter for searching for a pattern in a provided string and
  returning the result. (improvement)

  Contributed by mierdin. #3482

• Add test coverage and test timing capabilities to st2-run-pack-tests.
  The -c option enables test coverage and the -t option enables test timings.
  These capabilities have also been enabled in the ci pipeline for packs in the exchange.

  Contributed by Nick Maludy. #3508

• Update st2 CLI so it also displays "there are more results" note when -n flag is
  used and there are more items available. (improvement) #3552

• Add ability to explicitly set stream_url in st2client. (improvement) #3432

• Add support for handling arrays of dictionaries to st2 config CLI command. (improvement)
  #3594

  Contributed by Hiroyasu OHYAMA.

Fixed

• Fix st2client to display unicode characters in pack content description. (bug-fix)

• Don't automatically append .git suffix to repo URIs passed to packs.download action.
  This fixes a bug and now action also works with repo urls which don't contain .git suffix.
  (bug fix)

  Contributed by carbineneutral. #3534 #3544

• st2 pack commands now work when StackStorm servers are behind a HTTP/HTTPS proxy. You can set
  http_proxy or https_proxy environment variables for st2api and st2actionrunner
  processes and pack commands will work with proxy. Refer to documentation for details on
  proxy configuration. (bug-fix) #3137

• Fix API validation regression so all input data sent to some POST and PUT API endpoints is
  correctly validated. (bug fix) #3580

• Fix an API bug and allow users to create rules which reference actions which don't yet exist in
  the system when RBAC is enabled and user doesn't have system admin permission. (bug fix)
  #3572 #3573

  Reported by sibirajal.

• Add a check to make sure action exists in the POST of the action execution API. (bug fix)

• Fix api key generation, to use system user, when auth is disabled. (bug fix) #3578 #3593

• Fix invocation of Mistral workflow from Action Chain with jinja in params. (bug fix) #3440

• Fix st2client API bug, a backward incompatible change in query() method, introduced in note
  implementation (#3514) in 2.3.1. The query() method is now backward compatible (pre 2.3) and
  query_with_count() method is used for results pagination and note. #3616

v2.3.1

https://stackstorm.com/2017/07/06/stackstorm-2-3-1-bug-smashing/

Added

• Add support for passphrase parameter to remote-shell-script runner and as such, support
  for password protected SSH key files. (improvement)

  Reported by Sibiraja L, Nick Maludy.

• Add json_escape Jinja filter for escaping JSON strings. (improvement)

  Contributed by mierdin. #3480

• Print a note to stderr if there are more entries / results on the server side which are displayed
  to the user for the following list CLI commands: rule, execution,
  rule-enforcment, trace and trigger-instance.
  Default limit is 50. (improvement)

  Reported by Eugen C. #3488

Changed

• Update st2 run / st2 execution run command to display result of workflow actions when
  they finish. In the workflow case, result of the last task (action) of the workflow is used.
  (improvement) #3481

• Update Python runner so it mimics behavior from StackStorm pre 1.6 and returns action result as
  is (serialized as string) in case we are unable to serialize action result because it contains
  non-simple types (e.g. class instances) which can't be serialized.

  In v1.6 we introduced a change when in such instances, we simply returned None as result
  and didn't log anything which was confusing. (improvement) #3489

  Reported by Anthony Shaw.

• Add missing pagination support to /v1/apikeys API endpoint. (improvement) #3486

• Update action-chain runner so a default value for display_published runner parameter is
  True. This way it's consistent with Mistral runner behavior and intermediate variables
  published inside action-chain workflow are stored and displayed by default. #3518 #3519

  Reported by Jacob Floyd.

• Reduce API service (st2api) log clutter and log whole API response (API controller method
  return value / response body) under DEBUG log level instead of INFO. (improvement) #3539

  Reported by Sibiraja L.

• Enforce validation on position parameter for action parameters. If position values are not
  sequential or not unique, action registration will now fail. (bug-fix)
  (improvement) #3317 #3474

Fixed

• Fix ?name query param filter in /v1/actionalias API endpoint. (bug fix) #3503

• Notifier now consumes ActionExecution queue as opposed to LiveAction queue. With this
  change, the Jinja templates used in notify messages that refer to keys in ActionExecution
  resolve reliably. Previously, there was a race condition in which a LiveAction would have
  been updated but ActionExecution was not and therefore, the jinja templates weren't reliably
  resolved. (bug-fix) #3487 #3496

  Reported by Chris Katzmann, Nick Maludy.

• Deprecate results_tracker config group and move configuration variables to resultstracker
  group instead. If you have results_tracker config group in the config, it is recommended
  to switch to resultstracker instead. (bug-fix) #3500

• Update config loader so it correctly handles config schema default values which are falsey
  (False, None, 0, etc.) (bug-fix) #3504 #3531

  Reported by Simas Čepaitis.

• Fix st2ctl register failure to register rules in some race conditions.
  st2-register-content will now register internal trigger types by default. (bug-fix) #3542

• Correctly use service token TTL when generating temporary token for datastore service. This
  fixes a bug and allows user to set TTL value for non service tokens to less than 24 hours.
  (bug fix) #3523 #3524

  Reported by theuiz.

v2.3.0

https://stackstorm.com/2017/06/19/stackstorm-2-3-something-everyone/

• Refactor the action execution asynchronous callback functionality into the runner plugin architecture. (improvement)
• Introduce new CAPABILITIES constant on auth backend classes. With this constant, auth backends can advertise functionality they support (e.g. authenticate a user, retrieve information about a particular user, retrieve a list of groups a particular user is a member of). (new feature)
• Linux file watch sensor is now disabled by default. To enable it, set enabled: true in /opt/stackstorm/packs/linux/sensors/file_watch_sensor.yaml
• Add support for automatic RBAC role assignment based on the remote auth backend groups user is a member of (e.g. LDAP groups) and mappings defined in /opt/stackstorm/rbac/mappings directory. Note: This functionality is currently implemented for enterprise LDAP auth backend and only available in enterprise edition. (new feature)
• Update the code so user can specify arbitrary default TTL for access tokens in st2.conf and all the StackStorm services which rely on access tokens still work. Previously, the lowest TTL user could specify for all the services to still work was 24 hours. This has been fixed and the default TTL specified in the config now only affects user access tokens and services use special service access tokens with no max TTL limit. (bug fix) Reported by Jiang Wei. #3314 #3315
• Allow user to specify a custom list of attribute names which are masked in the log messages by setting log.mask_secrets_blacklist config option. (improvement)
• Update /executions/views/filters API endpoint so it excludes null / None from filter values for fields where null is not a valid field value. (improvement) Contributed by Cody A. Ray. #3193
• Make sure all the role assignments for a particular user are correctly deleted from the database after deleting an assignment file from /opt/stackstorm/rbac/assignments directory and running st2-apply-rbac-definitions tool. (bug fix)
• Add webhook payload to the Jinja render context when rendering Jinja variable inside rule criteria section.
• Implement RBAC for traces API endpoints. (improvement)
• Implement RBAC for API_KEY_CREATE permission type. (improvement)
• Implement RBAC for timers API endpoints. (improvement)
• Implement RBAC for webhooks get all and get one API endpoint. (improvement)
• Implement RBAC for policy types and policies get all and get one API endpoint. (improvement)
• Require ACTION_VIEW permission type to be able to access entry_point and parameters actions view controller. (improvement)
• Update /v1/rbac/permission_types and /v1/rbac/permission_types/<resource type> API endpoint to return a dictionary which also includes a description for each available permission type. (improvement)
• Require EXECUTION_VIEWS_FILTERS_LIST RBAC permission type to be able to access /executions/views/filters API endpoint. (improvement)
• Add webhook payload to the Jinja render context when rendering Jinja variable inside rule criteria section
• Switch file_watch_sensor in Linux pack to use trigger type with parameters. Now you can add a rule with file_path and sensor will pick up the file_path from the rule. A sample rule is provided in contrib/examples/rules/sample_rule_file_watch.yaml. (improvement)
• Cancel actions that are Mistral workflow when the parent workflow is cancelled. (improvement)
• Update st2rulesengine to exit non-0 on failure (bug fix) #3394 [Andrew Regan]
• Upgrade various internal Python library dependencies to the latest stable versions (pyyaml, requests, appscheduler, gitpython, paramiko, mongoengine, tooz).
• Fix a bug where trigger parameters and payloads were being validated regardless of the relevant settings in the configuration (system.validate_trigger_payload, system.validate_trigger_parameters). (bug fix)
• Fix system=True filter in the /v1/rbac/roles API endpoint so it works correctly. (bug fix)
• Add new /v1/rbac/role_assignments API endpoint for retrieving user role assignment information. (new feature)
• Add CLI commands for listing RBAC roles:
  • st2 role list [--system]
  • st2 role get <role id or name>
• Add CLI commands for listing RBAC user role assignments:
  • st2 role-assignment list [--role=<role name>] [--user=<username>]
  • st2 role-assignment get <role assignment id>
• Update /v1/rbac/roles API endpoint so it includes corresponding permission grant objects. Previously it only included permission grant ids. (improvement)
• Fix a bug where keyvalue objects weren't properly cast to numeric types. (bug fix)
• When action worker is being shutdown and action executions are being abandoned, invoke post run on the action executions to ensure operations such as callback is performed. (bug fix)
• Fix action chain runner workflows so variables (vars) and parameter values support non-ascii (unicode) characters. (bug fix)
• When RBAC is enabled and action is scheduled (ran) through the API, include rbac dictionary with user and roles action_context attribute. (improvement)
• Fix a bug in query base module when outstanding queries to mistral or other workflow engines could cause a tight loop without cooperative yield leading to 100% CPU usage by st2resultstracker process. (bug-fix)
• Make the query interval to third party workflow systems (including mistral) a configurable value. You can now set query_interval in [results_tracker] section in /etc/st2/st2.conf. With this, the default query interval is set to 20s as opposed to 0.1s which was rather aggressive and could cause CPU churn when there is a large number of outstanding workflows. (improvement)
• Ignore unicode related encoding errors which could occur in some circumstances when packs.setup_virtualenv fails due to a missing dependency or similar. (improvement, bug fix) #3337 [Sean Reifschneider]
• Update st2-apply-rbac-definitions so it also removes assignments for users which don't exist in the database. (improvement, bug fix)
• Add the following new actions to chatops pack:
  • chatops.match
  • chatops.match_and_execute
  • chatops.run
    #3425 [Anthony Shaw]
• Add new examples.forloop_chain action-chain workflow to the examples pack which demonstrates how to iterate over multiple pages inside a workflow. #3328 [Carles Figuerola]
• Fix a bug where action runner throws KeyError on abandoning action executions during process shutdown. (bug fix)
• Fix URL parsing bug where percent encoded URLs aren't decoded properly (bug fix)
• Add new core.uuid action for generating type 1 and type 4 UUIDs. [John Anderson] #3414
• Drop support for invalid semver versions strings (e.g. 2.0) in pack.yaml pack metadata. Only full semver version strings are supported, e.g. 2.1.1. This was originally deprecated in v2.1.0.
• Let st2 pack install register all available content in pack by default to be consistent with st2 pack register. (improvement) #3452
• The API endpoint for searching or showing packs has been updated to return an empty list instead of None when the pack was not found in the index. (bug fix)
• The dest_server parameter has been removed from the linux.scp action. Going forward simply specify the server as part of the source and / or destination arguments. (improvement) #3335 #3463 [Nick Maludy]
• Add missing database indexes which should speed up various queries on production deployments with large datasets. (improvement)
• Use a default value for a config item from config schema even if that config item is not required (required: false). (improvement) Reported by Nick Maludy #3468 #3469
• Removing empty config.yaml for packs pack so warning isn't thrown by default now that deprecation warning is in place. (improvement)

v2.2.1

https://stackstorm.com/2017/04/05/bugs-fixes-security-updates-st2-2-2-1/

• Fix st2ctl reload command so it preserves exit code from st2-register-content script and
  correctly fails on failure by default.

• Removed support for medium-strength ciphers from default nginx configuration (#3244)

• Fix base action alias test class (BaseActionAliasTestCase) so it also works if the local pack
  directory name doesn't match the pack name (this might be the case with new pack management
  during development where local git repository directory name doesn't match pack name) (bug fix)

• Fix a bug with default values from pack config schema not being passed via config to Python
  runner actions and sensors if pack didn't contain a config file in /opt/stackstorm/configs
  directory. (bug fix)

  Reported by Jon Middleton.

• Make various improvements and changes to st2-run-pack-tests script so it works out of the box
  on servers where StackStorm has been installed using packages. (improvement)

• Removed support for medium-strength ciphers from default nginx configuration (#3244)

• Allow user to specify which branch of st2tests repository to use by passing -b option to
  st2-self-check script. (improvement)

• Fix a bug with authentication middleware not working correctly when supplying credentials in an
  Authorization header using basic auth format when password contained a colon (:).

  Note: Usernames with colon are still not supported. (bug fix)

  Contributed by Carlos.

• Update st2-run-pack-tests script so it doesn't try to install global pack test dependencies
  (mock, unittest2, nose) when running in an environment where those dependencies are already
  available.

• Make sure remote command and script runner correctly close SSH connections after the action
  execution has completed. (bug fix)

  Reported by Nagy Krisztián.

• Fix a bug with pack configs API endpoint (PUT /v1/configs/) not working when RBAC was
  enabled. (bug fix)

  Reported by efenian.

• Fix concurrency related unit tests to support upgrade of the tooz library. (bug fix)

• Update tooz library to the latest version (v1.15.0). Using the latest version means
  StackStorm now also supports using consul, etcd and other new backends supported by
  tooz for coordination. (improvement)

• Various security related improvements in the enterprise LDAP auth backend. (improvement,
  bug fix)

• Fix a bug with config schema validation not being performed upon registration which could cause
  bad or empty config schema to end up in the system. (bug fix)

v2.2.0

https://stackstorm.com/2017/02/27/stackstorm-2-2/

• Fix /v1/packs/views/files/<pack ref or id> and
  /v1/packs/views/file/<pack ref or id>/<file path> API endpoint so it
  works correctly for packs where pack name is not equal to the pack ref. (bug fix)

  Reported by skjbulcher #3128

• Improve binary file detection and fix "pack files" API controller so it works correctly for
  new-style packs which are also git repositories. (bug fix)

• Fix returning a tuple from the Python runner so it also works correctly, even if action returns
  a complex type (e.g. Python class instance) as a result. (bug fix)

  Reported by skjbulcher #3133

• Introduce validation of trigger parameters when creating a rule for non-system (user-defined)
  trigger types.

  Validation is only performed if system.validate_trigger_parameters config option is enabled
  (it's disabled by default) and if trigger object defines parameters_schema attribute.

  Contribution by Hiroyasu OHYAMA. #3094

• Introduce validation of trigger payload for non-system and user-defined triggers which is
  performed when dispatching a trigger inside a sensor and when sending a trigger via custom
  webhook.

  Validation is only performed if system.validate_trigger_payload config option is enabled
  (it's disabled by default) and if trigger object defines payload_schema attribute.

  Contribution by Hiroyasu OHYAMA. #3094

• Add support for complex rendering inside of array and object types. This allows the user to
  nest Jinja variables in array and object types.

• Fix cancellation specified in concurrency policies to cancel actions appropriately. Previously,
  mistral workflow is orphaned and left in a running state. (bug fix)

• If a retry policy is defined, action executions under the context of a workflow will not be
  retried on timeout or failure. Previously, action execution will be retried but workflow is
  terminated. (bug fix)

• Update Python runner to throw a more user-friendly exception in case action metadata file
  references a script file which doesn't exist or which contains invalid syntax. (improvement)

• Update st2auth service so it includes more context and throws a more user-friendly exception
  when retrieving an auth backend instance fails. This makes it easier to debug and spot various
  auth backend issues related to typos, misconfiguration and similar. (improvement)

• Mistral fork is updated to match the master branch at OpenStack Mistral. (improvement)

• Fix how mistral client and resource managers are being used in the mistral runner. Authentication
  has changed in the mistral client. Fix unit test accordingly. (bug fix)

• Fix issue where passing a single integer member for an array parameter for an action would
  cause a type mismatch in the API (bug fix)

• Use the newly introduced CANCELLED state in mistral for workflow cancellation. Currently, st2
  put the workflow in a PAUSED state in mistral. (improvement)

• Add support for evaluating jinja expressions in mistral workflow definition where yaql
  expressions are typically accepted. (improvement)

• Let querier plugin decide whether to delete state object on error. Mistral querier will
  delete state object on workflow completion or when the workflow or task references no
  longer exists. (improvement)

• Add support for st2 login and st2 whoami commands. These add some additional functionality
  beyond the existing st2 auth command and actually works with the local configuration so that
  users do not have to.

• Fix action alias update API endpoint. (bug fix)

• Fix --config-file st2 CLI argument not correctly expanding the provided path if the path
  contained a reference to the user home directory (~, e.g. ~/.st2/config.ini) (bug fix)

• Fix action alias update API endpoint. (bug fix)

• {{user.}} and {{system.}} notations to access user and system
  scoped items from datastore are now unsupported. Use {{st2kv.user.}}
  and {{st2kv.system.}} instead. Please update all your content (actions, rules and
  workflows) to use the new notation. (improvement)

• Update the dependencies and the code base so we now also support MongoDB 3.4. Officially
  supported MongoDB versions are now MongoDB 3.2 and 3.4. Currently default version installed by
  the installer script still is 3.2. (improvement)

• Fix a bug with packs.download action and as such as pack install command not working with
  git repositories which used a default branch which was not master. (bug fix)

• Add new -j flag to the st2-run-pack-tests script. When this flag is specified script will
  just try to run the tests and it won't set up the virtual environment and install the
  dependencies. This flag can be used when virtual environment for pack tests already exists and
  when you know dependencies are already installed and up to date. (new feature)

• Fix a bug with --api-token / -t and other CLI option values not getting correctly
  propagated to all the API calls issued in the st2 pack install, st2 pack remove and
  st2 pack config commands. (bug fix)

• Fix a bug with not being able to apply some global permission types (permissions which are global
  and not specific to a resource) such as pack install, pack remove, pack search, etc. to a role
  using st2-apply-rbac-definitions. (bug fix)

v2.1.1

https://stackstorm.com/2016/12/20/quick-update-v2-1-1-published/

• After running st2 pack install CLI command display which packs have been installed.
  (improvement)

• Update /v1/packs/register API endpoint so it throws on failure (e.g. invalid pack or resource
  metadata). This way the default behavior is consistent with default
  st2ctl reload --register-all behavior.

  If user doesn't want the API endpoint to fail on failure, they can pass
  "fail_on_failure": false attribute in the request payload. (improvement)

• Throw a more user-friendly exception when registering packs (st2ctl reload) if pack ref /
  name is invalid. (improvement)

• core.http action now also supports HTTP basic auth and digest authentication by passing
  username and password parameter to the action. (new feature)

• Fix GET /v1/packs/<pack ref or id> API endpoint - make sure pack object is correctly returned
  when pack ref doesn't match pack name. Previously, 404 not found was thrown. (bug fix)

• Update local action runner so it supports and works with non-ascii (unicode) parameter keys and
  values. (bug fix)

  Contribution by Hiroyasu OHYAMA. #3116

• Update packs.load action to also register triggers by default. (improvement)

• Update /v1/packs/register API endpoint so it registers resources in the correct order which
  is the same as order used in st2-register-content script. (bug fix)

v2.1.0 - December 05, 2016

• Add new POST /v1/actionalias/match API endpoint which allows users to perform ChatOps action
  alias matching server-side. This makes it easier to build and maintain StackStorm ChatOps
  clients / adapters for various protocols and mediums. Clients can now be very thin wrappers
  around this new API endpoint.

  Also add two new corresponding CLI commands - st2 alias-execution match and
  st2 alias-execution execute. (new feature) #2895

  Contributed by Anthony Shaw

• Only allow valid word characters (a-z, 0-9 and _) to be used for action parameter
  names. Previously, due to bug in the code, any character was allowed.

  If you have an existing action definition which uses parameter with an invalid character, the
  parameter name needs to be adjusted otherwise action registration will fail. (bug fix,
  improvement)

• Adding ability to pass complex array types via CLI by first trying to
  seralize the array as JSON and then falling back to comma separated array.

• Add new core.pause action. This action behaves like sleep and can be used inside the action
  chain or Mistral workflows where waiting / sleeping is desired before proceeding with a next
  task. (new feature) #2933

  Contribution by Paul Mulvihill.

• Improve API exception handling and make sure 400 status code is returned instead of 500 on
  mongoengine field validation error. (improvement)

• Allow user to supply multiple resource ids using ?id query parameter when filtering
  "get all" API endpoint result set (e.g. ?id=1,2,3,4). This allows for a better client and
  servers performance when user is polling and interested in multiple resources such as polling on
  multiple action executions. (improvement)

• Actually validate pack metadata file when registering packs. (bug fix, improvement)

• Improve pack validation - now when the packs are registered we require that
  "version" attribute in the pack metadata file matches valid semver format and we also require
  that "email" attribute (if specified) contains a valid email address. (improvement)

• For consistency with new pack name validation changes, sample hello-st2 pack has been renamed
  to hello_st2.

• Add new stackstorm_version and system fields to the pack.yaml metadata file. Value of the
  first field can contain a specific for StackStorm version with which the pack is designed to work
  with (e.g. >=1.6.0,<2.2.0 or >2.0.0). This field is checked when installing / registering
  a pack and installation is aborted if pack doesn't support StackStorm version which is currently
  running. Second field can contain an object with optional system / OS level dependencies.
  (new feature)

• Require pack metadata version attribute to contain a valid semver version identifier (e.g
  0.1.0, 2.0.0, etc.). If version identifier is invalid, pack registration will fail.
  (improvement)

• When a policy cancels a request due to concurrency, it leaves end_timestamp set to None which
  the notifier expects to be a date. This causes an exception in "isotime.format()". A patch was
  released that catches this exception, and populates payload['end_timestamp'] with the equivalent
  of "datetime.now()" when the exception occurs.

• Adding check for datastore Client expired tokens used in sensor container

• Add new contributors field to the pack metadata file. This field can contain a list of
  people who have contributed to the pack. The format is Name <email>, e.g.
  Tomaz Muraus <[email protected]> (new feature)

• Update packs.install action (pack install command) to only load resources from the packs
  which are being installed. Also update it and remove "restart sensor container" step from the
  install workflow. This step hasn't been needed for a while now because sensor container
  dynamically reads a list of available sensors from the database and starts the sub processes.
  (improvement)

• Change st2api so that a full execution object is returned instead of an error message, when an
  API client requests cancellation of an execution that is already canceled

• Remove packs.info action because .gitinfo file has been deprecated with the new pack
  management approach. Now pack directories are actual checkouts of the corresponding pack git
  repositories so this file is not needed anymore.

• Speed up short-lived Python runner actions by up to 70%. This way done by re-organizing and
  re-factoring code to avoid expensive imports such as jsonschema, jinja2, kombu and mongoengine
  in the places where those imports are not actually needed and by various other optimizations.
  (improvement)

• Add new st2-validate-pack-config tool for validating config file against a particular config
  schema file. (new-feature)

• Upgrade various internal Python library dependencies to the latest stable versions (gunicorn,
  kombu, six, appscheduler, passlib, python-gnupg, semver, paramiko, python-keyczar, virtualenv).

• Improve performance of GET /executions/views/filters by creating additional indexes on
  executions collection

• Add support for default values and dynamic config values for nested config objects. (new feature,
  improvement)

• Throw a more user-friendly exception if rendering a dynamic configuration value inside the config
  fails. (improvement)

• Add support for ssh config file for ParamikoSSHrunner. Now ssh_config_file_path can be set
  in st2 config and can be used to access remote hosts when use_ssh_config is set to
  True. However, to access remote hosts, action paramters like username and
  password/private_key, if provided with action, will have precedence over the config file
  entry for the host. #2941 #3032 #3058 Eric Edgar

• Fix packs.uninstall action so it also deletes configs and policies which belong to
  the pack which is being uninstalled. (bug fix)

• Fix python action runner actions and make sure that modules from st2common/st2common/runners
  directory don't pollute PYTHONPATH for python runner actions. (bug fix)

v2.0.1 - September 30, 2016

• Fix st2 execution get command so now --attr argument correctly works with child
  properties of the result and trigger_instance dictionary (e.g. --attr result.stdout result.stderr). (bug fix)
• Update traces list API endpoint and st2 trace list so the traces are sorted by
  start_timestamp in descending order by default. This way it's consistent with executions
  list and -n CLI parameter works as expected. (improvement)
• Allow users to specify sort order when listing traces using the API endpoint by specifying
  ?sort_desc=True|False query parameters and by passing --sort=asc|desc parameter to
  the st2 trace list CLI command. (improvement)
• Fix a bug with action default parameter values not supporting Jinja template
  notation for parameters of type object. (bug fix, improvement)
• Fix --user / -u argument in the st2 key delete CLI command.
• Retry connecting to RabbitMQ on services start-up if connecting fails because
  of an intermediate network error or similar. (improvements)

v2.0.0 - August 31, 2016

• Implement custom jina filter functions to_json_string, to_yaml_string,
  to_human_time_from_seconds that can be used in actions and workflows. (improvement)

• Refactor jinja filter functions into appropriate modules. (improvement)

• Default chatops message to include time taken to complete an execution. This uses
  to_human_time_from_seconds function. (improvement)

• Fix a bug when jinja templates with filters (for example,
  st2 run core.local cmd='echo {{"1.6.0" | version_bump_minor}}') in parameters wasn't rendered
  correctly when executing actions. (bug-fix)

• Allow user to cancel multiple executions using a single invocation of st2 execution cancel
  command by passing multiple ids to the command -
  st2 execution cancel <id 1> <id 2> <id n> (improvement)

• We now execute --register-rules as part of st2ctl reload. PR raised by Vaishali:
  #2861 (comment)

• Bump default timeout for packs.load command from 60 to 100 seconds. (improvement)

• Change Python runner action and sensor Python module loading so the module is still loaded even if
  the module name clashes with another module which is already in PYTHONPATH
  (improvement)

• Fix validation of the action parameter type attribute provided in the YAML metadata.
  Previously we allowed any string value, now only valid types (object, string, number,
  integer, array, null) are allowed. (bug fix)

• Upgrade pip and virtualenv libraries used by StackStorm pack virtual environments to the latest
  versions (8.1.2 and 15.0.3).

• Allow user to list and view rules using the API even if a rule in the database references a
  non-existent trigger. This shouldn't happen during normal usage of StackStorm, but it makes it
  easier for the user to clean up in case database ends up in a inconsistent state. (improvement)

• Update packs.uninstall command to print a warning message if any rules in the system
  reference a trigger from a pack which is being uninstalled. (improvement)

• Fix disabling and enabling of a sensor through an API and CLI. (bug-fix)

• Fix HTTP runner so it works correctly when body is provided with newer versions of requests
  library (>= 2.11.0). (bug-fix) #2880

  Contribution by Shu Sugimoto.